Gsu 73/Gmu 44 Post-Installation Calibration Procedure; Post-Installation Calibration Procedure Summary - Garmin GDU 370 Installation Manual

8.3 GSU 73/GMU 44 Post-Installation Calibration Procedures
After mechanical and electrical installation of the GSU 73 AHRS and GMU 44 magnetometer have been
completed, prior to operation, a set of post-installation calibration procedures must be carried out.
Table 8-1 describes the necessary calibration procedures:
Table 8-1. Post-Installation Calibration Procedure Summary
Calibration Procedure Name
Procedure
A AHRS Orientation
B Pitch/Roll Offset
Compensation
C Magnetometer
Calibration
D Heading Offset
Compensation
E Engine Run-Up
Vibration Test
F Magnetometer
Interference Test
Page 8-4
Revision A
Procedure
Description
Validate GSU 73
Orientation
Level Aircraft
Compass Rose
Taxi Maneuver
Compass Rose
Alignment with
Magnetic North
Validate vibration
characteristics of
installation
Validate no
magnetic
interference with
GMU 44
G3X Installation Manual – Post Installation Checkout and Calibration Procedures
Installations Requiring
Procedure
Procedure A is required for all
installations
Procedure B is required for all
installations
Procedure C is required for all
installations
Installations in which GMU 44
alignment is not within 0.5° of
aircraft longitudinal axis
Procedure E is required for all
installations
Procedure F is required for initial
installation verification.
This test should also be repeated to
verify all subsequent electrical
changes associated with devices
within 10.0 feet of the GMU 44
magnetometer. Such changes
include, but are not limited to, wiring,
shielding or grounding changes to
any light, strobe, beacon or other
electrical device located in the same
wing as a GMU 44 unit. Likewise,
this test should also be repeated to
verify all subsequent changes to
materials within 10.0 feet of the
GMU 44. Such changes include,
but are not limited to, addition,
removal or modification of ferrous or
electrically conductive materials
located in the same wing as a GMU
44 unit.
Garmin recommends this test be
performed at least once every 12
months by all aircraft
manufacturers on a minimum of
one production aircraft for every
airframe type or model equipped
with the G3X system.
190-01115-01